Fundamentals, I never had a coach with the exception of basic military training and qualifications.
I did do some (low level sort of) security details guarding special weapons , aircraft perimeters yada yada. My primary mos was aircraft mechanic.
That didn't stop me from being in the right place at the wrong time occasionally. Lol
Anyway I was always a decent shot, competitive in clays but nothing else. Minute of deer and not much else.
I joined the hide and they lit a fire in my ass. So much expertise here it's incredible.
So my shooting got better my reloading got better a bit at a time.
The one thing that will be a benchmark is getting an ar to shoot under 1 moa, 3/4, 1/3 .
It can be done with tools less expensive than the best. Top shelf is not a necessity it's a luxury.
I still use sorted range brass.
My favorite trigger is a 2 stage from a Brownells completion kit.
It was slicked up with a stone and a lighter replacement spring used.
It all comes together fast once the first load takes shape.
Now I look forward to stretching out.